Перевод названия: GOLD FINDING FORMS AND RESTORATION`S PECULIARITIES OF Au (III) BY THE TAILINGS COMPONENTS OF GOLD-RECOVERY FACTORY
Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций
Конференция: XXV КОНФЕРЕНЦИЯ «АЛЮМИНИЙ СИБИРИ»; XV КОНФЕРЕНЦИЯ «ЗОЛОТО СИБИРИ»; XIII КОНФЕРЕНЦИЯ «МЕТАЛЛУРГИЯ ЦВЕТНЫХ, РЕДКИХ И БЛАГОРОДНЫХ МЕТАЛЛОВ »; Красноярск; Красноярск
Год издания: 2019
Аннотация: The paper presents data on easily mobile forms of gold associated with iron-containing compounds in technological samples of sulphide and oxidized tailings. Gold (III) can spontaneously recover on sulphide minerals and goethite, forming dispersed metal particles. It is known that in conditions of technogenic tailing dump can be a mПоказать полностьюigration of noble metals. It was shown that the processes of active concentration of gold occur, which are accompanied by the formation of a «new» submicron native gold. Movable colloidal particles of gold, which are often called «invisible», along with dissolved forms of gold, can easily move in volume with subsequent adsorption on iron oxides or organic constituents. The dissolved forms of gold can be restored to a metallic dispersed state on various minerals, for example, sulphide ones. The purpose of the work is the study of light-mobile forms of gold and the study of the recovery of gold (III) by minerals contained in old tailings of processing sulfide and oxidized ores of the gold-mining plant at one of the enterprises in the Krasnoyarsk Territory. In the present work, it was established that the tailings of sulphide ore processing contain up to 15% of light-moving gold, and up to 40% in tailings of processing of oxidized ores, which are probably associated with iron phases. As a result of the processing of tailings samples with a slightly alkaline solution, and subsequent acidification of the liquid phase with sulfuric acid, precipitation of iron and gypsum hexacyanoferrate occurs, on which secondary particles of micron-sized gold are found. Experiments were carried out on the reduction of gold (III) with iron (II), simulating the formation of iron hexacyanoferrate sediment. To do this, a solution of HAuCl4 was added to an aqueous solution of red blood salt and a concentrated solution of iron (II) sulfate was added. As a result, a precipitate`s formation of dark blue crystals insoluble in water was found. A numerous dispersed particles of gold with a size of 0.1-0.7 microns were revealed on the sediment by the electron microscopic method. Similar processes may occur in the conditions of the tailing dump. As noted above, dissolving gold in the form of Au3+ ions can migrate in the volume of the tailing dump and recover on various minerals under certain conditions. These processes were studied by intro-ducing gold (III) solutions into tailings materials. When mixing samples of tailings with a solution of gold (III), the pH lies in the neutral region of 6.9-7.3. Depending on the temperature and initial concentration of gold (III) in the solution, from 50 to 85% of gold is recovered. In case of gold`s (III) solution contact with tailings of sulphide ore processing, gold particles are found mainly on arsenopyrite, pyrite, and also in the form of complex structures with iron, tungsten and antimony. Gold is recovered in goethite and limonite on the tails of oxidized ores. Secondary particles of a complex structure are also presented, where gold is recovered on iron-containing phases with admixtures of valentine.
Журнал: ЦВЕТНЫЕ МЕТАЛЛЫ И МИНЕРАЛЫ - 2019
Номера страниц: 798-803
Издатель: Общество с ограниченной ответственностью "Научно-инновационный центр"